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Monoammonium Phosphate Residue. Monoammonium phosphate fire extinguishers are used to put out Class ABC fires. This type of residue must be cleaned by hand because it can irritate the skin and eyes if resuspended in the air with a vacuum cleaner.
How do dry chemical fire extinguishers work?
A dry chemical extinguisher sprays a very fine powder of sodium bicarbonate (NaHCO3, baking soda), potassium bicarbonate (KHCO3, nearly identical to baking soda), or monoammonium phosphate ( (NH4)H2PO4). These solids coat the fuel and smother the fire.
These are found in sizes containing from 5 to 20 pounds of monoammonium phosphate. Monoammonium phosphate is a finely ground extinguishing agent, which looks like yellow talcum powder. Nitrogen gas is used for propellant. This extinguisher is particularly effective on class A, B, and C fires but also extremely messy. Operation is fairly simple.
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How does a dry chemical fire extinguisher work?
A dry chemical extinguisher sprays a very fine powder of sodium bicarbonate (NaHCO3, baking soda), potassium bicarbonate (KHCO3, nearly identical to baking soda), or monoammonium phosphate ( (NH4)H2PO4). These solids coat the fuel and smother the fire. Cite This! "How do dry chemical fire extinguishers work?"
What type of fire extinguisher do I Need?
Dry chemical fire extinguishers are the most common home extinguishers. If you ask any firefighter what it takes to create a fire, you will learn that you have to have three things: Heat – There must be enough heat to get the fuel above its flash point.
How do you cut off oxygen from a fire?
You could do the same thing with just about any non-oxidizing gas (nitrogen, for example), but carbon dioxide is inexpensive and easy to store. Another way to cut off oxygen is to throw a blanket over the fire.
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The Smokin' Science of Fire Extinguishers Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher